Measurements, Units, and Unit Conversions

What is the purpose of measurements and units?

provides a detailed description of stuff like how fast a car is more or how heavy a bag is

What are dimensions?

the dimension of a physical quantity, refers to the type of quantity in question, regardless of the units used in the measurement

• ex: Length, Mass, Time

Types of dimensions

• Length (L)

• Mass (M)

• Time (T)

• Speed/Velocity (L)/(T)

• Acceleration (L)/(T²)

• Force (M)(L)/(T²)

What are the 7 fundamental quantities?

• Time (s)

• Length (m)

• Mass (kg)

• Electric current (ampere, A)

• Temperature (kelvin, K)

• Amount of substance (mole, mol)

• Luminous Intensity (candela, cd)

Common Prefixes

km (kilometers)

ms (milliseconds)

ug (micrograms)

Remember the chart

know the conversions for each one

peta (P)

10¹⁵

tera (T)

10¹²

giga (G)

10⁹

mega (M)

10⁶

kilo (k)

10³

hecto(h)

10²

deka (da)

10¹

deci (d)

10^-1

centi ©

10^-2

milli (m)

10^-3

micro (u)

10^-6

nano (n)

10^-9

pico (p)

10^-12

femto (f)

10^-15

The maximum speed limit on some highway in Canada is 100 km/h.
A. What is the speed limit m/s ?
B. What is the speed limit in miles/hour (mph)?
[ 1  = 1.609 ]

A. 27.8 m/s

B. 62.1 mi/hr

Robert Wadlow, was and still remains the world’s tallest man in
the world, with a height of 8 ft 11 inches. What is his height in
meters ?
[ 1m  = 39.37 inches ] [ 1ft = 12 inches ]

2.72m

Convert 12 g/cm3 to kg/m3

12000 kg/m³